FOSTER CITY -- Police seized a cache of assault rifles, ammunition and handguns, including one weapon stashed in a 3-year-old child's bedroom, from a man suspected of illegally selling guns from his home, authorities said.

After buying an AK-47 assault rifle and a Thompson gun as well as high capacity magazines and 1,000 rounds of ammunition from him in a parking area at his home on Thursday, undercover police arrested Steve Bowman, 40, said San Mateo County Narcotics Task Force Cmdr. John Munsey.

A search of his Foster City home on the 100 block of Rock Harbor Lane turned up a loaded handgun in the bedroom of Bowman's 3-year-old child, Munsey said. Police also raided a property tied to Bowman on the 3000 block of Cabrillo Street in San Francisco and found two more assault rifles, a rifle, 12 handguns and about 10,000 rounds of ammunition.

He was booked into the San Mateo County jail on suspicion of illegal gun sales and child endangerment, said Munsey. He was released on $150,000 bail and is due in San Mateo County Superior Court on May 28 if charges are filed, District Attorney Steve Wagstaffe said.